Dressing device for gear-grinding machines



Dec. 7 1926. 1,609,947

LE ROY E. JOLLS DRESSING DEVICE FOR GEAR GRINDING MACHINES Filed August2, 1923 I5 Sheets-Sheet 1 R I INVENTOR' JC/fiu (/ZZZS TTORNEY Dec. 71926. 1,609,947

LE ROY E. JOLLS DRESSING DEVICE FOR GEAR GRINDING MACHINES Filed August2, 1923 3 Sheets-Sheet 2 INKENTOR. ZeZZ ZTJO 425 %Z$ATTORNEY Dec. 71926. 1,609,947

1 LE ROY E. JOLLS DRESSING DEVICE FOR GEAR GRINDING MACHINES FiledAugust 2, 1923 3 Sheets-Sheet 5 'IIIIIIIIII IN VEN TOR.

JZ de F/OQS @434 TTORNEY Patented Dec. 7, 1926.

UNITED STATES PATENT OFFICE.

LE ROY E. JDLLS, OF DETROIT. MICHIGAN, ASSIGNOB, BY MESNE ASSIGNMENTS,TO GLEASON WORKS, OF ROCHESTER, NEW YORK. A CORPORATION OF NEW YORK.

DRESSING DEVICE FOR GEAR-GRINDING- MACHINES.

Application' filed August 2. 1923.

My invention relates to a dressing device for gear grinding machines,more particularly for machines adapted tothe grinding of gears havinglengthwise curved or spiral teeth, and it has for its object to providea simple and practicable device that enables maintaining thegrindingmember in proper form for accurately grinding the tooth profiles,preferably according to the involute system of generation.

To these and other ends, the invention consists in various features andcombinations of parts, all as will appear clearly from the followingdescription, when read in conjunction withthe accompanying drawings, thenovel features being pointed out in the claims following thedescription.

In the drawings:

Figure 1 is a plan view of a machine for grinding bevel gears, embodyingone arrangement of my invention;

Figure 2 is an end elevation, looking at the edge of the grindingmember;

Figure 3 is a sectional view on line 88 of Figure 2;

Figure 4 is a similar view showing the dressing device in reversedposition, and

Figure 5 is a sectional view on line 10-- 10 of Figure 2.

The invention is herein disclosed as ap-' plied to abevel geargenerating machine of the general type illustrated in Patents Nos.1,203,608, November 7, 1916, and No. 1,349,- 951, August 17, 1920, andthe mechanism for imparting the necessary indexing and generatingmovement to the gear blank, in proper relationship to the movement ofthe grinding member, form no part of this invention and may be of theform disclosed in said prior patents, so that a description of suchmechanism is not deemed necessary in the present application.

1 designates the gear blank mounted on a suitable blank support orspindle, while 2 designates the grinding member which is of annular facemill form to cooperate properly with circularly or otherwise curvedteeth on a gear.

The grinding member, which is formed of any suitable abrasive material,is of an nular face mill type for cooperation with lengthwise curvedgear teeth, the annular portion being of V-shaped cross-section andarranged to pass through a space between position of adjustment bySerial No. 655.247.

adjacent teeth and cooperate with either one and on its edge as often asrequired, and" the mechanism for performing the dressing operations onthe grinding member will now be described.

Referring to Figures 1, 2, 3, and-4r, 20 designates a reversible andoscillatory carrier for the dressing devices, preferably of cylindricalform and mounted within a stationary support or barrel 21. Arranged inthe carrier 20, at an angle to its axis of turning movement, is a holder22 which carries a dressing device 23. The holder 22 is actuated by anoperating member in the form of a screw 24, operated by a handle 25, andengaging a hollow threaded portion of the holder 22, so that by turningthe handle 25, the holder 22 and the dressing device 23 are movedlongitudinally, causing the dressing device 23 to traverse an operatingface of the grinding memberwhile the latter is rotated. To dress theoppositely inclined face of the grinding member, the carrier 20 isturned half way around in the support 21. moving it from the positionshown in Figure 3 to that shown in Figure 4, and thus reversing theposition and angle of the dressing device.

The opposite inclined faces of the grinding member are at slightlydifferent angles to the edge of the grinding member, and in order toprovide for this variation, the axis of turning of the carrier 20 isarranged at an angle to the rotary axis of the grinding member,corresponding to the difference in the angle of inclination between theopposite inclined faces of the grinding member, so that when thedressing device 23 is reversed,-it will cooperate properly with thecorresponding opposite faces of the grinding member.

The reversible carrier 20 is held in its a spring-controlled lockingbolt 26,.F1gure 5 actuated inwardly by a spring 27 and cooperating ,withone of the openings or sockets 28 in with a dressing device 31 arrangefor 00- ed to move the holder 22 and the dressing device 23 endwise andinto engagement with the corresponding inclined face of the grindingmember. The support 21 is carried on a standard 35, see Figure 2, havingan angular extension 36 pivoted at 27, and.

held in operating position by an attaching nut 38.

While the invention has beendescribed with reference to a particulararrangement, it is not limited tothe specific construction set forth,and this application is intended to cover any modifications ordepartures coming within the novel features of the improvement or thescope of the following claims.

I claim 1. In a gear grinding machine comprising an annular grindingmember of V-shaped cross-section, 'a dressing device movable intoengagement with one of the inclined operative faces of the annulargrinding member, a holder for the dressing device, a rotatable .carri'erin'which the holder is movable endwise, the" holder being movable fromone end of the carrier parallel to one of the inclined faces of thegrinding member, and .an actuating member located at the opposite end ofthe carrier and having threaded engagement With the holder to move thedressing device back and forth over an inclined face of the grindingmember.

2. In a gear grinding machine comprising an annular grinding member ofV- shaped cross-section, a dressing device movable sclectivelv intoengagement with either of the inclined operative faces of said grindingmember, a holder for the dressing device, a cylindrical support,.acylindrical carrier rotatably mounted in said support, the aforesaidholder being endwise movable of the carrier and mounted at an angle tothe longitudinal axis of the carrier whereby rotating of the carrierpermits the dressing device to move parallel to either respective- -lyof said inclined surfaces of the grinding member, and an actuatingmember having operative engagement with-said holder to move the latter.

3. In a gear grinding machine comprising an annular grinding member ofV- shaped cross-section, a cylindrical support, a cylindrical carriermounted in the support, a dressing device holder movable endwise of thecarrier at an angle to its longitudinal axis, the carrier beingrotatable to permit cooperation of said dressing device with eitherinclined operative face of the grinder, and a second dressing deviceholder fixedly mounted in the carrier for cooperation with the edge ofthe grinding member, the carrier having an oscillatory movement to bringthe latter dressing de viceholder into cooperative relation with theedge of the grinding member.

4. In a gear grinding machine comprising an annular grinding member ofV-shaped crosssection, a dressing device movable selectively intoengagement with either of the inclined operative faces of said grindingmember, a holder for the dressing device, a cylindrical support, acylindrical carrier rotatably mounted in said support, the aforesaidholder being endwise movable of the carrier and mounted at an angle tothe longitudinal axis of the carrier whereby rotating of the carrierpermits the dressing device to move parallel to either respectively ofsaid inclined surfaces of the grinding member, and an actuatingmemberhaving operative engagement with said holder to move the latter,the reversing axis of the carrier being at an angleto the rotary axis fthe grinding member.

5. In a gear grinding machine comprisin r an annulangrinding member ofV-shaped cross-section, a dressing device movable selectively intoengagement with either of the inclined operative faces of the grindingmember, a holder for the dressing device, a cylindrical support, acylindrical carrier that is rotatable in the cylindrical support,

said holder being endwise movable from one end of the carrier parallelto one of the inclined faces of the grinding member, and an actuatingmember at theopposite end of the carrier having threaded engagement withthe holder to move the dressing device back and forth across saidinclined face of the grinding member.

In witness whereof, I have hereunto signed my name.

LE ROY E. JOLLS.

